[python] Re: Dirks baby python - hanging pendulum
- From: Ray Schumacher <mtb@xxxxxxx>
- To: python@xxxxxxxxxxxxx
- Date: Tue, 21 Mar 2006 16:19:01 -0800
Hi Jens,
At 01:56 PM 3/21/2006, jens wrote:
But on Dirks baby python the centre of gravity is about at the same
hight(or even a little above) of the front wheel axis. Why it is
still self centering?
It is a common mis-conception that the axles are an important height;
the CG is still above the tire contact patches, and so is statically
unstable - it will fall over if sitting still.
The self-centering is due to the angle of the pivot (usually being
~80>a>~45), and the fact that the pivot axis intersection with the
ground is between the contact patches - if the pivot is to turn, the
pivot/CG _must_ rise.
Think also of the ice racers; the blade can be fixed to the frame, so
there is no axle, but the steering behaves the same.
Is it less stable then pythons having the piviot and/or the GC below
the Front wheel axis?
A low CG is more difficult to control, the comparison was made here
about balancing a pencil vs. a broomstick.
BTW, I don't think anyone's body CG is below their axles(?). The
pivot usually is.
Cheers,
Ray
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